The life-into-counters math gets squeezed harder in this format than the rate suggests, because the trigger fires on every other creature entering after she resolves, and TMT's common bodies sit at exactly the power band the card most wants to multiply. A 2/2 for two becomes a 4/4 for two life; the 
2/3s and 3/2s outclass whatever the opponent drew on curve. Against a medium-speed midrange field the life ceiling is wide, which is what makes the engine worth building around rather than splashing.
WB Legendaries is the headline home: the archetype wants the legendary tag for the set's payoffs anyway and plays the flat, repeated curve-outs this card converts most efficiently. BG Food-Sacrifice competes for it on different terms. Food tokens (Anchovy & Banana Pizza, Omni-Cheese Pizza) refund the life and keep the engine running across long games, where WB just races the life total down and hopes the board closes first. Mardu builds leaning on Sneak get a third look, since each Sneaked body is another entry to double.
Pick band sits P1P2 to P1P4 in any base-black deck, drifting later only when black is heavily cut. Maindeck always. The 1/3 deathtouch body trades into the 2/2 and 3/2 commons all day while the counters accumulate behind it, and it survives Bot Bashing Time at face value.
The sequencing tax is real: she has to be on the battlefield before your bodies enter, so a turn where you hold her behind a creature you already cast is a turn of wasted triggers. That makes her vulnerable on the turn she lands and does nothing, which is exactly when Stomped by the Foot, the removal every black deck holds, takes her clean. Dimensional Exile is the other answer, and the on-color mirror is built to find one before the counters start stacking.
